Lets see! Haven't done these except for RA snorkel Protecting warranty. Seams like ultimate for 4B11 engine, day to day motoring. Other then a turbo is :- RA snorkel, 4-2-1 extractor, high flow cat, 2.25 or 2.5 inch piping, may be 1 or 2 resonators for peace of mind, and a free flow matching muffler. Above, knowledge based on info gained from analasist of various forums over time. According to expert tuners 2.25 or 2.5 inch exhaust much of a muchness. Original air filter is just fine. 4-2-1 or 4-1 extractors. 4-1 more power suite street racing. 4-2-1 better torque and low down grunt for legal speed limits! and power where you need it for day to day driving. Bingo!!!!! Wonder what power and torque figures will show up. Maybe a dyno test, can give us some idea!